knowles



1 0 6 4 "CROSS REFERENCE ExArmraEa (No Model.)

B. R. KNOWLES.

INGANDESGENT ELEGTRIG LAMP. "No. 282,460. Patented July 31, 1883.

Ma M

' ence being had to the accompanying drawings,

UNITED STATES.

PATENT OFFICE}.

ED\VARD It. KNOWLES, OF BROOKLYN, NEW YORK, ASSTGNOR OF ONE-HALE TOBYRON A. BROOKS, OF SAME PLACE.

INCANDESCEN'F ELECTRIC LAMP.

SPECIFICATION forming part of Iletters Patent No. 282,460, dated July31, 1883.

Application filed June 12, 1882. (No model.) 7 y z I ya. 3 7

To all whom it may concern; Be it known that I, EDWARD R. Knownns ofBrooklyn, in the county of Kings and State of New' York, have inventedcertain new and 5 useful Improvements in Incandescent Electric Lamps, ofwhich the followingis a description in such full, clear, concise, andexact terms as to enable any one skilled in the art to which itappertains or with which it is most nearly connected to make and use thesame, refermaking part of this specification, and to the figures andletters of reference marked thereon.

My invention consists of a novel means for sealing theilluminating-chamber of the lamp.

The constructionand operation of the lamp is as follows: the points ofnovelty being designated by the claim concluding the specification:

Figure 1 is a vertical section through the lamp. The other figuresindicate parts in detail, to be hereinafter referred to.

Like letters refer to like parts on all the figures.

The illuminating-chamber of the lamp is made of glass and is illustratedby A. The illuminating-conductor is made of carbon, and is shown by C.It is supported by small cylin ders E, of carbon, into each of which acavity is made of the desired form and depth to recicve the ends of theburner, and into which Q is placed around the ends of the conductor acement composed of bichloride of platinum latlnuiii black or platinumsponge an sugar a" mix ure of in 1a-1n an a mum atinum black or s on eand wa 61:31 waterass all e w ich, w en dry, form a good con: uctor ofelectricity and bind the illuminatingconduetor firmly to thesupporting-cylinders 40 E. The ends of the illuminating-conductors beingfitted to the supporting-cylinders, as described, they are connected tothe ends of the electrodes G by means of cupsF, soldered to or formedupon the ends of the electrodes in the manner shown. The ends of theelecbon slipped in the cup, which, being made a little less iii-diameterthan the carbon, grips a nipple or cavity, X, of glass, around the Q21)conductors on the top side of the inverted cup,

.ing-chamber of the lamp and insert it in the trodes being held inpositionby an insulating-- brace, H, and to insure a perfect contactbeit firmly and formsa close contact and permanent connection betweenthe two. The ends of the carbons may be coated with-the cementabove-mentioned, if necessary, to insure a more perfect contact.

Various modifications of making the conneetion and electricah contactbetween theilluminating-conductor and the electrodes are shown by Fig.3. E shows the cylinder perforated' at both ends, the end of theilluminating-conductor beingconneeted in one and the electrode in theother. E" shows the support-- ing-cylinder slitted and the end of theburner passed snugly in the slit. E shows the cylinder perforated in thetop end only, having the burner set in, as described. F shows the cupslit longitudinally to receive the end of the cylinder, as described. F"shows a spiral tube on the end of the electrode toreceive thesupporting-tube. F," and F" show the ends of the illuminating-conductorssupported in divided pieces of carbon V V, set in cups connected to theelectrodes, all of which are different forms of the same principle, andeither of which will make a very good connection and electrical contactbetween the burner and the electrode and avoid the necessity ofenlarging the connecting-ends of the burners.

In the construction of the lamp, before connecting theilluminating-conductors and electrodes as I have described, I make acup, I,of glass, somewhat in the form of a cone, through the top ofwhich I pass the electrodes, making by which to seal the electrodesair-tight, either by fusing the glass around them or by a cementsealing. After securing theelectrodes in the cup I, I make a second cup,J, in the form of a cylindrical ring, and fill it with a suitablecement, B, into which cement I invert the cup I and press its sides downto the bottom of the cup J. I then take the illuminatcement over the cupI and press its sides also down to the bottom of the cup J-. Then, afterallowing the cement time to set and harden, I exhaust the air throughthe tube B, which is then closed by fusing, the chamber being firstcharged with nitrogen gas unless it is intended to illuminate in vacuum.The lamp, having been thus constructed, is set upon an insulat- I bywhich the current can be gradually trans 2o ing base-piece, L, againstthe bottom of which is fixed the metal sectors M, Fig.4, between which,and insulated from them, the metal piece '1 is placed, and theconductors G are connected electrically to the sectors M. Now, to makethe electrical connection between the lightingeircuit and the lamp, afixture, 1, is made and faced with an insulating-disk, 0, into which themetal sectors N, Fig. 2, are set, to which the eircuit-comluctois andare connected. The lamp is then set on this fixture and held by apivot-bolt, K. secured at its lower end by a serew,Q. By these means thelamp is lett free to turn about the pivot as a center and place thecontacts N M in or out of circuit, as may be desired, to illuminate orextinguish the lamp. The contact-points M and N may consist of a seriesof metal points instead of single sectors,

ferred from the circuit to the lamp, as shown by Fie. 6.

H aving thus described my improved l'amp, I Clililll as my inventio'1i-In an incandescent electric lamp, the combination of aninclosing-chambcr, A, an inverted cup, I, to support the electrodes, and

in which they are hermetically sealed, and

a sealing-cup, J, the end of the inclosing chamber and the invertedsupporting-cup being both set in the sealing-cup and hermetically sealedtherein with any suitable sealing material, substantially as hereindescribed.

EDWARD R. KNOWLES.

Witnesses:

J. EDGAR BULL, B. A BRooKs.

